JP5167578B2 - Construction method for underground structures - Google Patents

Description

  The present invention relates to a method for constructing an underground structure in which a construction girder is constructed as a permanent structure, and more particularly, to a method for constructing an underpass structure that underpasses a vehicle track such as a railway track or road using a shield machine. .

  For example, when constructing an underground structure that underpasses the lower part of the railroad track, the entire wire cutting method that cuts and constructs the entire line and the lower part of the track are constructed without cutting, and the approach part is opened and constructed. The partial cutting method is used. In the all-line open-cut method, a work girder is installed for the train to run between the supporting piles under the operating railway track, and the ground structure under the work girder is excavated while supporting the upper load with the work girder. This is a construction method. That is, as shown in FIG. 19, the support pile 101 is built below the railway track, the construction girder 102 installed under the railway track is supported by the support pile 101, and the earth retaining piles 103 are provided on both sides of the planned construction site. This is a construction method in which the ground under the construction girder is excavated inside the retaining pile 103, the underground structure 100 is constructed in the excavated place, and then backfilled.

As a partial excavation method, for example, a start shaft and a reach shaft are provided in parallel with the railroad track, and a pipe roof is propelled from the start shaft to the reach shaft so as to cross the railroad track. There is a method of constructing an underground structure while supporting the upper load. That is, as shown in FIG. 20, after the pipe roof 105 is propelled from the start shaft into the ground, a work space 106 is formed while excavating the ground below the pipe roof 105, and this work space 106 is used. This is a construction method for constructing the underground structure 104 (see, for example, Patent Document 1).
JP 7-259108 A

  In the above-mentioned full-line open-cut method, in order to install a construction girder and construct an underground structure at a location excavated under this construction girder, the construction work of the underground structure is performed after the construction girder is installed. Therefore, there was a problem that the installation work of the construction girder and the construction work of the underground structure could not be performed at the same time, and the construction period was long. In addition, the construction work of the underground structure is performed in a confined space under the work girder, and there is a problem that workability is poor and quality control is difficult. Furthermore, in order to construct an underground structure including an upper floor slab below the work girder, there was a problem that the earth covering from the track surface of the vehicle was increased and the distance of the approach section to the underground structure was increased. In addition, there is a problem that the environment is burdened because the ground above the construction part of the underground structure has to be excavated.

  In the above-mentioned partial excavation method, since the work for excavating the shaft takes time and effort, there is a problem that the construction period becomes long and the construction cost becomes high. Moreover, since the approach section to the underground structure has to be constructed after excavating the shaft, there is a problem that the construction period becomes longer. Moreover, since the pile driver and heavy machinery are used for excavation of the shaft, it is difficult to reduce noise and vibration. Further, when the pipe roof is propelled and installed between the shafts, there is a problem that a large site is required because the mountain retaining material is laid in a range where the pipe roof protrudes greatly from the outer shell of the underground structure. Furthermore, the work in the shaft has a problem in that it is difficult to secure a scaffold in a narrow range of work and the workability is poor.

  The present invention has been made in view of the above problems, and provides a construction method of an underground structure that uses a construction girder as an upper floor slab of an underground structure, and is an underground that has excellent economic efficiency in a short period of time. The purpose is to construct a structure.

In order to achieve the above object, the underground construction method according to the present invention is an underground structure construction method for constructing an underpass structure that underpasses a vehicle track such as an existing railway track or road. The tunnel structure is constructed by supporting the vehicle track with a construction girder, excavating a tunnel below the vehicle track with a shield machine, and installing a segment. The underpass structure is formed by removing the construction girder and installing a permanent girder.

A construction method for an underground structure according to a second aspect of the present invention is a construction method for an underground structure for constructing an underpass structure that underpasses a vehicle track such as an existing railroad track or road. Support the work girder, start the shield machine from the ground, construct a descent approach section with a predetermined descent, and tunnel the work girder by installing a segment from the end point of the descent approach section Build an underpass section supported by the substructure, build an ascending approach section with a predetermined ascending slope from the end point of the underpass section, let the shield machine reach the ground, and remove the construction girder The underpass structure is configured by installing a main girder.

According to a third invention, in the first or second invention, the substantially U-shaped tunnel part structure is constructed by installing the segments in a substantially U shape, the main girder is used as an upper floor board, and the substantially U shape. The underpass structure having the tunnel part structure as a wall / lower floor plate is configured.

In a fourth aspect based on the second aspect , the ascending approach section and the descending approach section include a semi-ground part whose excavation part is open to the ground.

A fifth invention is characterized in that, in the fourth invention, the semi-ground middle segment is arranged in a ring shape or a rectangular shape, and a part thereof is later removed and constructed in a substantially U shape.

According to the construction method of the underground structure of the present invention, since the main girder is used as the upper floor slab of the underground structure, the earth covering can be minimized. Therefore, the distance of the approach section to the underground structure can be shortened. In addition, the walls and lower floor slabs of the underground structure will be constructed while excavating with a shield machine. Therefore, the construction period of the underground structure can be dramatically shortened.

  Moreover, according to the construction method of the underground structure of the present invention, the shield machine starts on the ground and reaches the ground. Therefore, the shaft excavation work and construction work are not required, and the construction period can be shortened. In addition, no noise or vibration is generated by a pile driver.

  Furthermore, according to the construction method of the underground structure of the present invention, the shield machine is constructed in the order of the descending approach section, the underpass section, and the ascending approach section. Therefore, the installation work of the construction and permanent girder or the construction girder and the construction work of the downward approach section, and the construction and removal of the temporary part of the permanent girder or the installation work of the permanent girder and the construction work of the upward approach section are performed. Since construction can be performed at the same time, the construction period can be shortened.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. For convenience of understanding the invention, a method for constructing a tunnel that underpasses a railroad track will be described. However, the application target of the present invention is not limited to a railroad track, and is a basement constructed below an existing structure. Widely applicable to structures.

  FIG. 1 is a plan view showing an installation state of a construction and permanent girder according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. 1, and FIG. It is -B 'sectional drawing.

  As shown in FIGS. 1 to 3, the support pile 2 is driven into the ground on both sides of the rail 1 of the railroad track that is the vehicle track, the rail 1 is temporarily removed, and the H-section steel is placed on the support pile 2 on both sides. A construction and permanent girder 5 is installed through a gantry 4 comprising: After the installation of the construction and main girder 5, the rail 1 is laid on the girder 5 so that the train can run. The construction and permanent girder 5 is composed of a permanent portion 5a and temporary portions 5b connected to both sides thereof, and fittings that are fitted to each other on the connecting surfaces of the permanent portion 5a and the temporary portion 5b. A mating groove and a fitting projection are provided and are detachable. The main installation part 5 a and the temporary installation part 5 b are installed on the gantry 4 in a state of being fitted and integrated, and the temporary installation part 5 b is installed above the support pile 2. Here, the width of the main portion 5a is shorter than the outer surface widths of both end portions 20a and 20b of a U-shaped structure 20 (described later) that is a tunnel structure, and is longer than the inner surface width. . This construction and permanent girder 5 is made of reinforced concrete, that is, a precast plate, and may be manufactured on site or manufactured in a factory and carried into the site.

  FIG. 4 is a diagram illustrating a construction method of the downlink approach section 12 using the shield machine 10 according to the first embodiment of the present invention.

  The tunnel 11 constructed by the construction method of the underground structure of the present invention includes a down approach section 12 having a down slope for reaching the depth of the lower surface of the construction and main girder 5 from the ground starting portion 15, The underpass section 13 underpasses the rail 1 at the bottom surface depth of the main girder 5 and the up approach section 14 having an ascending slope for reaching the ground reaching unit 16 from the end of the underpass section 13. .

  Below, the construction method of the tunnel 11 which underpasses the downward direction of the rail 1 with the shield machine 10 is demonstrated according to the construction procedure of the tunnel 11. FIG. First, the construction method of the downlink approach section 12 by the shield machine 10 will be described.

  As shown in FIG. 4, the shield machine 10 excavates the ground with the cutter head 17 and enters the ground from the ground starting portion 15 into the ground with a predetermined downward slope. The earth and sand excavated by the cutter head 17 is agitated in the excavation chamber 18 immediately behind the cutter head 17 through a partition wall, and a mud-forming agent for promoting plastic fluidization of the excavated earth and sand is injected as needed. The The plastic fluidized sediment is fed to the back of the shield machine 10 main body by a soil removal device 19 such as a screw conveyor.

  While digging down the descending approach section 12 by the shield machine 10, the descending approach section 12 is constructed by sequentially installing segments on the inner surface of the excavated portion behind the shield machine 10. The descending approach section 12 is a semi-ground part in a semi-underground state in which a U-shaped structure 20 is constructed by arranging segments in a U shape and the upper part is open to the ground.

Next, a method for excavating the underpass section 13 will be described.
FIG. 5 is a view showing a construction method of the underpass section 13 using the shield machine 10 according to the first embodiment of the present invention, and FIG. 6 is a view taken along the line CC ′ of FIG. As shown in FIG. 5, after constructing the downlink approach section 12, the underpass section 13 is constructed continuously. Here, the slope of the shield machine 10 main body is the same as the slope of the underpass section 13, that is, the slope of the construction and permanent girder 5, and the top surface of the excavation cross section by the shield machine 10 is the construction and permanent girder 5. The shield machine 10 is adjusted so as to be at a position below a predetermined gap for disposing a support (described later) from the lower surface of the shield. Then, the shield machine 10 is dug, and as shown in FIG. 6, the lower surface of the construction and permanent girder 5 is exposed by excavating directly under the construction and permanent girder 5.

  FIG. 7 is a cross-sectional view in the transverse direction of the underpass section 13 after the shield machine 10 according to the first embodiment of the present invention has passed. A U-shaped structure 20 is constructed by installing a U-shaped segment in the rear while the shield machine 10 is digging directly under the construction and permanent girder 5, and as shown in FIG. Is supported by the U-shaped structure 20 via a support 6 composed of a laminated rubber 6a and a non-shrink mortar 6b for fixing the laminated rubber 6a. Here, the laminated rubber 6a of the support 6 is fixed to the construction and permanent girder 5 with a fixing material such as an anchor bar (not shown), and the lower part of the laminated rubber 6a is attached to the U-shaped structure 20. It arrange | positions in a mold, and it fixes to the U-shaped structure 20 by filling this mold with the non-shrink mortar 6b and solidifying. When digging with the shield machine 10, the central axis of the excavation and the main installation part are arranged so that both end parts 20a, 20b of the U-shaped structure 20 are close to predetermined positions on both end parts of the main installation part 5a. Drilling with the central axis of 5a aligned.

Next, a method for constructing the uplink approach section 14 will be described.
FIG. 8 is a diagram illustrating a construction method of the uplink approach section 14 using the shield machine 10 according to the first embodiment of the present invention. As shown in FIG. 8, after constructing the underpass section 13, the uplink approach section 14 is constructed continuously. Here, the shield machine 10 is adjusted so that the gradient of the main body of the shield machine 10 is the same as the predetermined gradient of the ascending approach section 14, and the digging is performed toward the ground reaching unit 16 with the predetermined ascending gradient. While excavating the ascending approach section 14 by the shield machine 10, a U-shaped structure 20 is constructed by arranging segments behind the shield machine 10 in the same manner as the approach approach section 12 described above, and the upper part is open to the ground. It will be the middle part of the semi-finished area.

  FIG. 9 is a cross-sectional view of the underpass section 13 according to the first embodiment of the present invention. After constructing the ascending approach section 14, as shown in FIG. 9, the temporary portion 5b, the gantry 4 and the support pile 2 are removed. The temporary portion 5b, the gantry 4 and the like are removed, the parapet 22 is attached, and the underpass section 13 is constructed with the construction and main girder 5 as the upper floor slab and the U-shaped structure 20 as the wall / lower floor slab.

  In the present embodiment, the method of removing the temporary part 5b, the gantry 4 and the like after the ascending approach section 14 is constructed has been described. However, the present invention is not limited to this. You may use the method of removing the temporary part 5b, the mount frame 4 grade | etc.,.

  FIG. 10 is a diagram showing the tunnel 11 constructed by the underground construction method according to the first embodiment of the present invention. As shown in FIG. 10, the tunnel 11 is excavated by the shield machine 10, the down approach section 12 having the U-shaped structure 20 as the wall / lower floor slab, and the construction / main girder 5 as the upper floor slab, U-shaped structure. An underpass section 13 having the object 20 as a wall / lower floor slab and an ascending approach section 14 having the U-shaped structure 20 as a wall / lower floor slab are configured.

  FIG. 11 is a plan view showing an intersection of the tunnel 11 and the rail 1 constructed by the underground construction method according to the first embodiment of the present invention. As shown in road A and road B, road C and road D in FIG. 11, the construction of the tunnel 11 in the crossing direction of the rail 1 divides the road, which was conventionally one, inconvenience to neighboring residents. Therefore, the road bridge 23 for connecting the road A and the road B and the road C and the road D are installed above the down approach section 12 and the up approach section 14 near the rail 1, respectively. The convenience of

  In the construction method of the underground structure in the present embodiment, since the construction and permanent girder 5 is used as the upper floor slab of the tunnel 11, the earth covering can be minimized. Therefore, the distance between the downlink / uplink approach sections 12 and 14 can be shortened.

  Further, a U-shaped structure 20 used as a wall / lower floor slab of the tunnel 11 is constructed while excavating with the shield machine 10. Therefore, the construction period of the tunnel 11 can be dramatically shortened.

  And the shield machine 10 starts on the ground and reaches the ground. Therefore, the shaft excavation work and construction work are not required, and the construction period can be shortened. In addition, no noise or vibration is generated by a pile driver.

  Further, the shield machine 10 is constructed in the order of the down approach section 12, the underpass section 13, and the up approach section 14. Therefore, the installation work of the construction and permanent girder 5 and the construction work of the downward approach section 12 can be performed simultaneously with the construction work of the temporary construction 5b of the construction and permanent girder 5 and the construction work of the upward approach section 14. Therefore, the construction period can be shortened.

  In the present embodiment, the method of removing the temporary part 5b when the underpass section 13 is constructed using the construction and permanent girder 5 including the permanent part 5a and the temporary part 5b has been described. However, the present invention is not limited thereto. Instead of this, a method using the construction and permanent girder 5 consisting only of the permanent portion 5a may be used. Here, when this method is used, the gantry 4, the support plate 3, and the support pile 2 are buried.

  Next, an embodiment different from the first embodiment in the present invention will be described. In the following description, the same reference numerals are given to portions corresponding to those using the same technique as in the first embodiment, and description thereof is omitted.

  FIG. 12 is a cross-sectional view showing the installation state of the construction beam according to the second embodiment of the present invention. As shown in FIG. 12, the support pile 2 is driven into the ground on both sides of the rail 1 of the railroad track, the rail 1 is temporarily removed, and the work girder 8 is installed on the support pile 2 via the gantry 4. After the construction girder 8 is installed, the rail 1 is laid on the girder 8 so that the train can run. The construction girder 8 is made of reinforced concrete, that is, a precast version, and may be manufactured on site or manufactured at a factory and carried into the site.

FIG. 13 is a diagram illustrating a construction method of the downlink approach section 12 using the shield machine 10 according to the second embodiment of the present invention.
The tunnel 31 constructed by the construction method of the underground structure of the present invention has a downward approach section 12 for reaching the depth of the lower surface of the work girder 8 from the ground starting portion 15 and the lower surface depth of the work girder 8. The underpass section 33 underpasses the rail 1 and the ascending approach section 14 for reaching the ground arrival unit 16 from the end of the underpass section 33.

  As shown in FIG. 13, the shield machine 10 enters the ground from the ground starting portion 15 into the ground with a predetermined downward slope, as in the first embodiment. Then, the descending approach section 12 is constructed by sequentially installing the segments while digging the descending approach section 12 by the shield machine 10. The descending approach section 12 is a semi-ground part in a semi-underground state in which a U-shaped structure 20 is constructed by arranging segments in a U shape and the upper part is open to the ground.

  FIG. 14 is a diagram illustrating a construction method of the underpass section 33 using the shield machine 10 according to the second embodiment of the present invention. As shown in FIG. 14, after constructing the downlink approach section 12, the underpass section 33 is constructed continuously. Here, the slope of the main body of the shield machine 10 is made the same as the predetermined slope of the underpass section 33, that is, the slope of the work beam 8, and the upper surface of the excavation cross section by the shield machine 10 extends from the lower surface of the work beam 8 to the support 6. The shield machine 10 is adjusted so as to be in a lower position by a predetermined gap for placement. And the shield machine 10 is dug, and the bottom of the work girder 8 is exposed by excavating the work beam 8 directly below.

  FIG. 15 is a cross-sectional view in the transverse direction of the underpass section 33 after the shield machine 10 according to the second embodiment of the present invention has passed. As shown in FIG. 15, a U-shaped structure 20 is constructed by installing a U-shaped segment on the rear side while digging the shield machine 10 directly below the work girder 8, and the work girder 8 is connected via the support 6. It is supported by a U-shaped structure 20. Here, the support 6 is not attached to the work girder 8 and the U-shaped structure 20 but is temporarily attached.

  FIG. 16 is a diagram illustrating a construction method of the uplink approach section 14 using the shield machine 10 according to the second embodiment of the present invention. As shown in FIG. 16, after constructing the underpass section 33, the uplink approach section 14 is constructed. Here, similarly to the first embodiment, the shield machine 10 is adjusted so that the gradient of the shield machine 10 main body is the same as the predetermined gradient of the ascending approach section 14, and the predetermined ascending gradient toward the ground reaching unit 16. Dig in. While excavating the ascending approach section 14 with the shield machine 10, similarly to the descending approach section 12 described above, the U-shaped structure 20 is constructed by disposing the segments, and the upper half of the half ground is open to the ground. To do.

  FIG. 17 is a transverse sectional view of the underpass section 33 according to the second embodiment of the present invention. After constructing the ascending approach section 14, as shown in FIG. 17, the construction girder 8, the gantry 4 and the support pile 2 are removed, the main girder 9 is installed, the parapet 22 is attached, and the main girder 9 is installed on the upper floor slab. The underpass section 33 is constructed with the U-shaped structure 20 as a wall / lower floor slab. Here, the support 6 is attached to the main girder 9 and the U-shaped structure 20 as in the first embodiment.

  FIG. 18 is a view showing the tunnel 31 constructed by the construction method of the underground structure according to the second embodiment of the present invention. As shown in FIG. 18, the tunnel 31 is excavated by the shield machine 10, and the down approach section 12 having the U-shaped structure 20 as the wall / lower floor slab, and the main girder 9 as the upper floor slab and the U-shaped structure 20. Is composed of an underpass section 33 having a wall / lower floor slab and an up approach section 14 having the U-shaped structure 20 as a wall / lower floor slab. Similarly to the first embodiment, the road bridge 23 is installed in the upper part of the down approach section 12 and the up approach section 14 near the main girder 9 for the convenience of the neighboring residents.

  In the present embodiment, the method of removing the construction girder 8, the gantry 4 and the like after the ascending approach section 14 is constructed has been described. However, the present invention is not limited to this. A method of removing the construction girder 8 and the gantry 4 and installing the main girder 9 may be used.

  In the construction method of the underground structure in the present embodiment, since the main girder 9 is used as the upper floor slab of the tunnel 31, the earth covering can be minimized. Therefore, the distance between the downlink / uplink approach sections 12 and 14 can be shortened. Further, the U-shaped structure 20 to be used as the wall / lower floor slab of the tunnel 31 is constructed while excavating with the shield machine 10. Therefore, the construction period of the tunnel 31 can be dramatically shortened. And the shield machine 10 starts on the ground and reaches the ground. Therefore, the shaft excavation work and construction work are not required, and the construction period can be shortened. In addition, no noise or vibration is generated by a pile driver. Further, the shield machine 10 is constructed in the order of the down approach section 12, the underpass section 33, and the up approach section 14. Therefore, the installation work of the construction girder 8 and the construction work of the down approach section 12 can be performed simultaneously with the work of removing the construction girder 8 and installing the main girder 9 and the construction work of the up approach section 14. Therefore, the construction period can be shortened.

  In all the embodiments described above, the method of constructing the U-shaped structure 20 by installing U-shaped segments in the underpass sections 13 and 33 and the down / upward approach sections 12 and 14 has been described. For example, (1) A U-shaped structure 20 is constructed in the underpass sections 13 and 33 to support the construction / main construction girder 5 or the construction girder 8 or the main girder 9, and to descend -In order to obtain sufficient propulsive force of the shield machine 10 in the ascending approach sections 12 and 14, a rectangular segment is constructed to construct a rectangular structure, and the open part to the ground is only the entrance part to the rectangular structure. In the method to make a state, or (1), after constructing the rectangular structure of the descending and ascending approach sections 12, 14, the ground exposed portion of the rectangular structure is removed and the upper part is opened to the ground. Or (2) by setting rectangular segments in the underpass sections 13 and 33 and the down / upward approach sections 12 and 14 to construct all sections with rectangular structures, A method of supporting the construction and permanent girder 5 or the construction girder 8 or the permanent girder 9 with 33 rectangular structures, and having only the entrance to the rectangular structure open to the ground, or (2) , After constructing the rectangular structure of the down and up approach sections 12 and 14, the ground exposed portion of the rectangular structure is removed and the upper part is opened to the ground, or (3) the underpass section 13 33, a method of constructing a rectangular structure to support the construction and permanent girder 5 or the construction girder 8 or the permanent girder 9, and constructing a U-shaped structure 20 in the down / upward approach sections 12 and 14, Noiz It may be used either.

  Moreover, in all embodiment mentioned above, although the method of removing the mount frame 4 and the support pile 2 was demonstrated, it is not limited to this, The mount frame 4 and the support pile 2 are good also as being killed.

  Furthermore, in all the above-described embodiments, the method of using the construction and permanent girder 5 or the construction girder 8 or the permanent girder 9 by the track receiving type has been described. However, the present invention is not limited to this. Alternatively, a method using the construction and permanent girder 5 or the construction girder 8 or the permanent girder 9 by other methods such as a holding type and a tank type may be used.

It is a top view which shows the installation state of the construction and permanent installation girder which concerns on 1st embodiment of this invention. It is A-A 'sectional drawing of FIG. It is B-B 'sectional drawing of FIG. It is a figure which shows the construction method of the down approach area using the shield machine which concerns on 1st embodiment of this invention. It is a figure which shows the construction method of the underpass area using the shield machine which concerns on 1st embodiment of this invention. FIG. 6 is a C-C ′ arrow view of FIG. 5. It is a transverse direction sectional view of the underpass section after the shield machine concerning a first embodiment of the present invention passes. It is a figure which shows the construction method of the up approach area using the shield machine which concerns on 1st embodiment of this invention. It is sectional drawing of the underpass area which concerns on 1st embodiment of this invention. It is a figure which shows the tunnel constructed | assembled with the construction method of the underground structure which concerns on 1st embodiment of this invention. It is a top view which shows the cross | intersection part of the tunnel and rail constructed | assembled with the construction method of the underground structure which concerns on 1st embodiment of this invention. It is sectional drawing which shows the installation state of the construction girder which concerns on 2nd embodiment of this invention. It is a figure which shows the construction method of the downward approach area using the shield machine which concerns on 2nd embodiment of this invention. It is a figure which shows the construction method of the underpass area using the shield machine which concerns on 2nd embodiment of this invention. It is a transverse direction sectional view of the underpass section after the shield machine concerning a second embodiment of the present invention passes. It is a figure which shows the construction method of the up approach area using the shield machine which concerns on 2nd embodiment of this invention. It is a transverse direction sectional view of an underpass section concerning a second embodiment of the present invention. It is a figure which shows the tunnel constructed | assembled with the construction method of the underground structure which concerns on 2nd embodiment of this invention. It is a figure which shows the Example of the conventional full wire cutting method. It is a figure which shows the Example of the conventional partial cutting method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rail 2 Support pile 4 Mount 5 Construction and permanent girder 5a Main part 5b Temporary part 6 Support 6a Laminated rubber 6b Non-shrink mortar 8 Construction girder 9 Main girder 10 Shield machine 11 Tunnel 12 Down approach section 13 Underpass section 14 Uphill approach section 15 Ground start section 16 Ground reach section 17 Cutter head 18 Excavation chamber 19 Earth removal device 20 U-shaped structure 22 Parapet 23 Road bridge 31 Tunnel 33 Underpass section 100 Underground structure 101 Support pile 102 Construction girder 103 Earth retaining Pile 104 Underground structure 105 Pipe roof 106 Work space

Claims (5)

An underground structure construction method for constructing an underpass structure that underpasses a vehicle track such as an existing railway track or road,
Support the vehicle track with a construction girder,
By constructing a tunnel structure by excavating a tunnel below the vehicle track with a shield machine and installing a segment,
Support the construction girder with the tunnel structure,
A construction method for an underground structure, wherein the underpass structure is configured by removing the construction girder and installing a main girder. An underground structure construction method for constructing an underpass structure that underpasses a vehicle track such as an existing railway track or road,
Support the vehicle track with a construction girder,
Start the shield machine from the ground, build a down approach section with a predetermined down slope,
By constructing an underpass section that supports the construction girder with a tunnel structure by installing a segment from the end point of the downward approach section,
From the end point of the underpass section, construct an up approach section having a predetermined up slope,
Let the shield machine reach the ground,
A construction method for an underground structure, wherein the underpass structure is configured by removing the construction girder and installing a main girder.   By constructing the substantially U-shaped tunnel part structure by installing the segments in a substantially U shape, the undersole is configured such that the main girder is an upper floor board and the substantially U-shaped tunnel part structure is a wall / lower floor board. The construction method of an underground structure according to claim 1 or 2, wherein a path structure is formed.   The construction method for an underground structure according to claim 2, wherein the ascending approach section and the descending approach section include a semi-ground part whose excavation part is open to the ground.   5. The construction method for an underground structure according to claim 4, wherein the semi-ground middle segment is arranged in an annular shape or a rectangular shape, and a part of the segment is removed later and is constructed in a substantially U shape.

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